Gravity recovery using COSMIC GPS data: application of orbital perturbation theory |
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Authors: | C Hwang |
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Institution: | (1) Department of Civil Engineering, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu 300, Taiwan e-mail: hwang@geodesy.cv.nctu.edu.tw; Tel.: +886-3-5724739; Fax: +886-3-5716257, TW |
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Abstract: | COSMIC is a joint Taiwan–US mission to study the atmosphere using the Global Positioning System (GPS) occultation technique.
Improved formulas are developed for the radial, along-track, and cross-track perturbations, which are more accurate than the
commonly used order-zero formulas. The formulas are used to simulate gravity recovery using the geodetic GPS data of COSMIC
in the operational phase. Results show that the EGM96 model can be improved up to degree 26 using 1 year of COSMIC data. TOPEX/POSEIDON
altimeter data are used to derive a temporal gravity variation. COSMIC cannot reproduce this gravity variation perfectly because
of data noise and orbital configuration, but the recovered field clearly shows the gravity signature due to mass movement
in an El Ni?o.
Received: 3 March 2000 / Accepted: 10 November 2000 |
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Keywords: | : COSMIC GPS Orbit perturbation Temporal gravity variation El Ni?o |
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